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Finding the Fourth Proportional to 2,809.86, 3,877.86 and 1,615

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Solution

The fourth proportional to 2,809.86, 3,877.86 and 1,615 is: 2,228.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.86 : 3,877.86 = 1,615 : x
  2. Step 2: Convert to fraction form
    2,809.86/3,877.86 = 1,615/x
  3. Step 3: Cross multiply
    2,809.86x = 3,877.86 × 1,615
  4. Step 4: Simplify right side
    2,809.86x = 6,262,743.90
  5. Step 5: Solve for x
    x = 6,262,743.90/2,809.86
  6. Step 6: Final answer
    x = 2,228.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.